Hiz.
how r u all?
i want some help regarding SMPS. im using PUSH-PULL terminology to make 12Volts.
i want multiple output voltages. +12V, 5V and 3.5V.
kindly tell me any terminology to do this.
thx
@ Goldsmith
Thx for ur reply. my input is 24VDC and output is 12VDC - 15A with 5VDC and 3.3VDC of 100mA for some ICs.
basically i have no problem in making 12VDC - 15A. the main problem is to make other voltages.
hope u understand my problem
Dear Muhammad
Hi again
well , it is possible and very simple .
I can suggest you a fly back converter for this low power . it will be simple and economic . you can use a uc3844 or uc3845 driver ic to build your aim !
Best Wishes
Goldsmith
Yeah I have to agree here. If the 5V and 3.3V rails each only need 100mA, compared to the 12V rail at 15A, then using a multiple output SMPS is probably much more trouble than it's worth. Using linear regulators off the 12V rail would barely put a dent in your overall efficiency, and you wouldn't have to worry about cross regulation.Use a SMPS to convert 24V to 12V efficiently, then use a linear regulator to take 12V down to 5V, and another LDO to take 5V down to 3.3V. With that topology, you just have one switching stage to contend with and minimal power dissipation in your linear regulators.
after a long research, i will wind three winding on transformer. 1st input, 2nd 12v (high current) and 3rd for the regulators for 5 and 3.5V.
i know the science of transformer but dont know fly back converter.
Can u post any application note with some real calculations and design guidelines, which could really help me
Hi againcan u also tell me the Snubber calculations??? kindly plz tell me the exact formula and others. i dont wana do PHd in SNUBBERS LOL
Dear pol
Hi
How much is your frequency ? and how did you test it ? and what are the number of turns ?
Best Wishes
Goldsmith
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